Actinium is a chemical element with the symbol Ac. Actinium is a silvery, radioactive, metallic element. Actinium was discovered in by Andre Louis.
Atomic weight – 227 g·mol−1
Electron configuration – 6d1 7s2
Electrons per shell – 2, 8, 18, 32, 18, 9, 2
Density 10.04 g·cm−3
Melting point – 1320 K
Boiling point – 3470 K
Actinium is valuable as a neutron source.
225Ac is used in medicine.
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